single.dvi 50 The Andrew File System (AFS) The Andrew File System was introduced at Carnegie-Mellon University (CMU) 1 in the 1980’s [H+88]. Led by the well-known Professor M. Satya- narayanan of Carnegie-Mellon University (“Satya” for short), the main goal of this project was simple: scale. Specifically, how can one design a distributed file system such […]
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single.dvi 39 Interlude: Files and Directories Thus far we have seen the development of two key operating system ab- stractions: the process, which is a virtualization of the CPU, and the ad- dress space, which is a virtualization of memory. In tandem, these two abstractions allow a program to run as if it is in
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single.dvi 38 Redundant Arrays of Inexpensive Disks (RAIDs) When we use a disk, we sometimes wish it to be faster; I/O operations are slow and thus can be the bottleneck for the entire system. When we use a disk, we sometimes wish it to be larger; more and more data is being put online and
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single.dvi H Laboratory: xv6 Projects NOTE: Projects are slowing being added to https://github.com/ remzi-arpacidusseau/ostep-projects, which includes project descriptions and a simple testing framework. Please be sure to check that out if interested. This chapter presents some ideas for projects related to the xv6 kernel. The kernel is available from MIT and is quite fun to
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CS 111: Operating System Principles Lab 0 A Kernel Seedling 1.0.5 Jon Eyolfson March 29, 2021 Due: April 9, 2021 In this lab, you’ll setup a virtual machine and write your (probably) first kernel module. We’ll use VirtualBox as our hypervisor since it supports many different host operating systems, and is friendly to learn. You’ll
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single.dvi 23 Complete Virtual Memory Systems Before we end our study of virtualizing memory, let us take a closer look at how entire virtual memory systems are put together. We’ve seen key elements of such systems, including numerous page-table designs, inter- actions with the TLB (sometimes, even handled by the OS itself), and strategies for
20 Paging: Smaller Tables We now tackle the second problem that paging introduces: page tables are too big and thus consume too much memory. Let’s start out with a linear page table. As you might recall1, linear page tables get pretty big. Assume again a 32-bit address space (232 bytes), with 4KB (212 byte) pages
single.dvi 6 Mechanism: Limited Direct Execution In order to virtualize the CPU, the operating system needs to somehow share the physical CPU among many jobs running seemingly at the same time. The basic idea is simple: run one process for a little while, then run another one, and so forth. By time sharing the CPU
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Lecture 1 CS 111: Operating System Principles Overview 1.0.1 Jon Eyolfson March 30, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ “All problems in computer science can be solved by another level of indirection” – David Wheeler 1 An Operating System Sits between Applications and Hardware Application Operating
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Lecture 18 CS 111: Operating System Principles Filesystems 1.0.1 Jon Eyolfson May 18, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Filesystems Usual layout of a POSIX Filesystem (here: parts of FHS): / etcdevbin home mnt jon todo.txt usb Working Directory: /home/jon What are the absolute and realtive
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